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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Strengthening Rectangular Concrete Columns Using FRP: A New Technique
Author(s): T. Rizk, I. Mahfouz, and S. Sarkani
Publication: Special Publication
Appears on pages(s): 881-904
Keywords: concrete; fiber-reinforced polymers; repair; strengthening; upgrading
Abstract:The objective of this paper is $to introduce an innovative sandwich wrapping confining system (SWCS) for upgrading and repairing rectangular columns. The system described here replaces the conventional fiber reinforced polymer (FRP) wrapping, which has only axial stiffness, by a sandwich wrapping confining system that has both axial and flexural stiffness. The new system is made up of two FRP faces separated by a light incompressible core. Experimental and numerical analyses are performed on rectangular columns upgraded and repaired using the SWCS. Thuty rectangular columns with different dimensions are upgraded and repaired using the SWCS and tested to failure. A numerical study based on nonlinear finite-element analysis (material nonlinearity) is used to investigate the behavior of the columns repaired using the SWCS and to predict the experimental failure loads. Finally, the experimental and the analytical results are compared. Unlilce conventional FRP jackets, the SWCS can be used to improve the strength, stiffness, and ductility of rectangular columns.
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